MH88620BR

® MH88620BR C.O. SLIC Preliminary Information Features 900 ohm input impedance Externally selectable network balances Transformerless 2-4 wire conversion Programmable constant resistance feed Off-Hook and Dial pulse detection High immunity to externally induced longitudinal currents Auto ring trip On-hook transmission (ANI) capability Minimum protection circuitry required Compatible with requirements of TELEBRAS DOC/FCC, CSA/UL, CCITT Excellent power dissipation (SIL vertical mounting) MH88620BR ISSUE 3 April 1995 Ordering Information 40 Pin SIL Package 0° C to 70° C Description The Mitel MH88620BR SLIC provides all of the functions required to interface 2-wire off premise subscriber loops to a serial TDM, PCM, switching network of a modern PBX. The MH88620BR is manufactured using thick film hybrid technology which offers high voltage capability, reliability and high density resulting in significant printed circuit board area savings. A complete line card can be implemented with very few external components. Applications On/Off-Premise PBX Line Cards Central Office Line Cards VBat LGND LCA VDD VEE AGND RING RF1 RF2 TIP TF1 TF2 Auto Ring Trip Matched Feed Resistors Driver Circuitry and Speech Circuit Loop Current Set Switch-Hook Threshold Set Ring Filter Switch-Hook Detect SHK Impedance Network 2W/4W conversion N1 N2 TRD Test Relay Driver Ring Relay Driver Gain Adjust TRC RGND VRLY RNGC RRD Z1 Z2 GRX1 GRX0 RX GTX1 GTX0 TX ...